Directional valve symbol simulation

Directional Valve Symbol Experiments

1. Select Free>1_Simple Cylinder Control, from the drop-down list.

♦ Click on the blue circles to activate the valve and observe its perfomance.

♦ Click on the directional valve to open the DCV Setup box.

♦ Click the top drop down box menu to select and change the valve's centre condition.

♦ Experiment with the different centre conditions to observe their effect on the pump and actuator operating conditions.

♦ Change the pump from fixed to variable displacement and then experiment with the different valve centre conditions again.

2. Select Directional>4_2way 2posn Valve, from the drop-down list.

♦ Operate the directional valve and observe how switches the flow.

3. Select Directional>5_3way 2posn Valve, from the drop-down list.

♦ Operate the directional valve and observe how switches the flow.

Consider1: Directional valve centre conditions will affect the load and therefore the input power required by the pump.

Question 1: What centre condition requires the lowest power input power with a fixed displacement pump?

Answer

Consider2: Spool valves will always have a small amount of leakage between ports.

Question 2: What is the key difference to the cylinder lines between having all ports closed, in the centre condition, and A + B to tank?

Answer